/                                        /|
              /                                        / |
             /                                        /  |
            +----------------------------------------+   |
            |                                        |   |
            |                                        |   |
            |                                        |   |
            |         ###    #####   ###             |   |
            |         #  #     #     #  #            |   |
            |         ###      #     ###             |   |
            |         # #      #     #               |   |
            |         #  # # ##### # #    #          |   |
            |                                        |   |
            |         Unknown_Error's grave          |   |
            |                                        |   |
            |                                        |   |
            | Famous saying:Luogu will be notorious  |   |
            |                                        |   |
            |                  ----                  |   |
            |                  ||||                  |   |
            |                  ||||                  |   |
            |                  ||||                  |   |
            |            ------||||------            |   |
            |            ||||||||||||||||            |   |
            |            ------||||------            |   |
            |                  ||||                  |   |-------------------+
            |                  ||||                  |   |                  /|
            |                  ||||                  |   |                 / |
           /|                  ||||                  |   |                /  +
          / |                  ||||                  |   |               /  /
         /  |                  ----                  |   |              /  /
        /   |                                        |   |             /  /
       /    |     Made by andyzhu444(uid:575655)     |   |            /  /
      /     |                                        |   |           /  /
     /      |         Want to know anymore?          |   +          /  /
    /       |    See "BV1fb411w7Qj" in bilibili.     |  /          /  /
   /        |                                        | /          /  /
  /         |                                        |/          /  /
 /          +----------------------------------------+          /  /
/                                                              /  /```